Laser Crystal Cr:YAG

Cr:YAG, or chromium-doped yttrium aluminum garnet, is a laser active crystal that is commonly used in solid-state lasers. Cr:YAG has a cubic crystal structure and is doped with chromium ions, which allow it to amplify light through stimulated emission.

One of the main advantages of Cr:YAG as a laser active crystal is its ability to generate laser emissions at a wavelength of 1064 nanometers, which is the same as Nd:YAG lasers. However, Cr:YAG lasers have several advantages over Nd:YAG lasers, such as a wider absorption bandwidth and a higher efficiency for generating short pulses.

Cr:YAG lasers are typically pumped by a flashlamp or a diode laser, which excites the chromium ions in the crystal and causes them to emit light at a longer wavelength. Cr:YAG lasers can also be mode-locked, which allows them to generate ultra-short pulses in the picosecond or femtosecond range.

Cr:YAG lasers are used in a variety of applications, such as laser marking, welding, and cutting of metals and ceramics. They are also used in scientific research, particularly in the field of ultrafast laser spectroscopy.

Mechanical Properties
Mohs hardness 8.5
Thermal conductivity, W x °K-1 x cm-1 0.12
Termooptical factor (dn/dt) 8.0 x 10-6 x °K-1
Spectral Properties
Operating transition 3A2 - 3T2
Absorption band, nm 900 - 1150
Emission band, nm 1340 - 1580
Dopant level, at/cm3 1017 - 1018
Damage threshold at 1064 nm, 10 ns, MW/cm2 500
Upper-level lifetime at 300°K, ms 3.6
Quantum yield at 300°K, % 12
Absorption cross section at 1064 nm, cm2 5.0 x 10-18
Emission cross section at 1420 nm, cm2 4.5 x 10-19

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